α-Pyrrolidinopentiophenone (α-PVP; Item No. 9001083) is an analog of pyrovalerone (Item No. 10817), a known monoamine transport inhibitor that prevents the reuptake of dopamine and norepinephrine.1,2 4-fluoro-α-PVP is an isomer of α-PVP characterized by the addition of a fluorine group at the 4 position of the phenyl ring. The biochemical, physiological, and toxicological properties of this compound have not been determined. This product is intended for forensic and research applications.